{"action":"created","issue":{"url":"https://api.github.com/repos/OpenDroneMap/WebODM/issues/276","repository_url":"https://api.github.com/repos/OpenDroneMap/WebODM","labels_url":"https://api.github.com/repos/OpenDroneMap/WebODM/issues/276/labels{/name}","comments_url":"https://api.github.com/repos/OpenDroneMap/WebODM/issues/276/comments","events_url":"https://api.github.com/repos/OpenDroneMap/WebODM/issues/276/events","html_url":"https://github.com/OpenDroneMap/WebODM/issues/276","id":253702647,"number":276,"title":"Geo-referencing Inaccurate","user":{"login":"dsandson","id":31405278,"avatar_url":"https://avatars2.githubusercontent.com/u/31405278?v=4","gravatar_id":"","url":"https://api.github.com/users/dsandson","html_url":"https://github.com/dsandson","followers_url":"https://api.github.com/users/dsandson/followers","following_url":"https://api.github.com/users/dsandson/following{/other_user}","gists_url":"https://api.github.com/users/dsandson/gists{/gist_id}","starred_url":"https://api.github.com/users/dsandson/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dsandson/subscriptions","organizations_url":"https://api.github.com/users/dsandson/orgs","repos_url":"https://api.github.com/users/dsandson/repos","events_url":"https://api.github.com/users/dsandson/events{/privacy}","received_events_url":"https://api.github.com/users/dsandson/received_events","type":"User","site_admin":false},"labels":[{"id":421370662,"url":"https://api.github.com/repos/OpenDroneMap/WebODM/labels/question","name":"question","color":"cc317c","default":true},{"id":421370657,"url":"https://api.github.com/repos/OpenDroneMap/WebODM/labels/software%20fault","name":"software fault","color":"e99695","default":false}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":8,"created_at":"2017-08-29T15:16:59Z","updated_at":"2017-10-19T20:56:52Z","closed_at":null,"author_association":"NONE","body":"I've been trying out WebODM for a little while now, and trying to gain enough knowledge to incorporate it into my work.\r\n\r\nI have installed Ubuntu 16.04 LTS, and got WebODM up and running in Docker.\r\n\r\nI gathered a data set with RTK GPS surveyed GCPs, then used the recommended technique of loading the images in QGIS & building a GCP list.txt file, with coords set to EPSG:29902 (Irish Grid). I also realise that georeferencing has issues with the default image resizing, so I've ran the process with 'skip-resize'.\r\n\r\nWhen the process has finished I have loaded the original GCPs in QGIS, alongside the orthophoto, both set to EPSG:29902. However I would expect the GCPs visible on the ortho to align with the point layer GCPs. However they are out by between 8.9-12.4 meters.\r\n\r\nThe process was run with the following flags;\r\nmin-num-features: 8000, mesh-size: 150000, dem-terrain-type: ComplexNonForest, skip-resize: true, use-25dmesh: true\r\n\r\nI've checked the gcp file, with the original survey coords and they're correct. also double checked the image coords. Cant see what else is incorrect. \r\n\r\nI've used the following guidance on compiling the GCP file;\r\nhttps://smathermather.com/2015/03/01/opendronemap-gcp-file-format/\r\nNot sure if this is up to date, or if theres a new improved technique.\r\n\r\nScreenshot from QGIS and WebODM log (hopefully) attached, as well as GCP file. I can provide a link to the raw images if needed.\r\n\r\nRegards\r\nDavid"},"comment":{"url":"https://api.github.com/repos/OpenDroneMap/WebODM/issues/comments/338035558","html_url":"https://github.com/OpenDroneMap/WebODM/issues/276#issuecomment-338035558","issue_url":"https://api.github.com/repos/OpenDroneMap/WebODM/issues/276","id":338035558,"user":{"login":"pierotofy","id":1951843,"avatar_url":"https://avatars1.githubusercontent.com/u/1951843?v=4","gravatar_id":"","url":"https://api.github.com/users/pierotofy","html_url":"https://github.com/pierotofy","followers_url":"https://api.github.com/users/pierotofy/followers","following_url":"https://api.github.com/users/pierotofy/following{/other_user}","gists_url":"https://api.github.com/users/pierotofy/gists{/gist_id}","starred_url":"https://api.github.com/users/pierotofy/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/pierotofy/subscriptions","organizations_url":"https://api.github.com/users/pierotofy/orgs","repos_url":"https://api.github.com/users/pierotofy/repos","events_url":"https://api.github.com/users/pierotofy/events{/privacy}","received_events_url":"https://api.github.com/users/pierotofy/received_events","type":"User","site_admin":false},"created_at":"2017-10-19T20:56:52Z","updated_at":"2017-10-19T20:56:52Z","author_association":"MEMBER","body":"This issue was moved to http://community.opendronemap.org/t/geo-referencing-inaccurate/44"}}
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